AI is so far behind I doubt they will ever get it off of the ground, even with the money TAF gifted them.
As far as the who, I can't say. But I've been approached by a national AMC to be a mentor and they claim their proprietary course is currently being reviewed for approval, possible roll out this summer.
As far as the reason PAREA was slammed down our throats, I flat out disagree with your opinion. The person who almost single handedly developed this thing over the prior 5 or so years left his job with a bag of money right when PAREA was approved by the AQB to become the chief appraiser at one of the oldest/largest AMC's in existence. The old term "cui bono" applies with PAREA. Large AMCs will have their programs spitting out staff long before the AI rolls out their "buy in" to the appraisal profession class, and the names associated with those AMCs were heavily involved. The AI was absent and by the time they roll anything out I doubt if anyone will cough up the sure to be sky high tuition to "buy in" on the residential side.
And again, there is no official mentor criteria or requirement to have one at any point in the PAREA process before or after.